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CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parenthetical) - $ / shares
shares in Thousands
Apr. 30, 2020
Apr. 30, 2019
Shareholders' Equity    
Preferred Stock, par value (in dollars per share) $ 1 $ 1
Preferred Stock, shares authorized (in shares) 2,000 2,000
Preferred Stock, shares issued (in shares) 0 0
Class A [Member]    
Shareholders' Equity    
Common Stock, par value (in dollars per share) $ 1 $ 1
Common Stock, shares authorized (in shares) 180,000 180,000
Common Stock, shares issued (in shares) 70,166 70,127
Treasury stock (in shares) 23,405 22,634
Class B [Member]    
Shareholders' Equity    
Common Stock, par value (in dollars per share) $ 1 $ 1
Common Stock, shares authorized (in shares) 72,000 72,000
Common Stock, shares issued (in shares) 13,016 13,055
Treasury stock (in shares) 3,920 3,918